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In 1946, he resumed his legal practice in New York City but soon moved to the capital city of [[Denver]], Colorado, at which he became a founding partner of the law firm Holland & Hart, founded by Joseph Holland and Steve Hart, no relation to Dominick's last political opponent, Gary Hart.<ref>{{cite web|url=https://www.washingtonpost.com/archive/local/1981/03/20/peter-h-dominick-dies-served-2-terms-in-senate/f9d8525f-d30d-4110-8ac0-cca04eea950e/|author=J. Y. Smith|title=Peter H. Dominick dies; served 2 terms in Senate|date=March 20, 1981|accessdate=July 15, 2021|publisher=''[[The Washington Post]]''}}</ref><ref name=statesman/>

In 1946, he resumed his legal practice in New York City but soon moved to the capital city of [[Denver]], Colorado, at which he became a founding partner of the law firm Holland & Hart, founded by Joseph Holland and Steve Hart, no relation to Dominick's last political opponent, Gary Hart.<ref>{{cite web|url=https://www.washingtonpost.com/archive/local/1981/03/20/peter-h-dominick-dies-served-2-terms-in-senate/f9d8525f-d30d-4110-8ac0-cca04eea950e/|author=J. Y. Smith|title=Peter H. Dominick dies; served 2 terms in Senate|date=March 20, 1981|accessdate=July 15, 2021|publisher=''[[The Washington Post]]''}}</ref><ref name=statesman/>

In 1956, Dominick was elected as a state representative, a post he filled  from 1957 to 1961. In 1960, with Richard Nixon carrying Colorado over [[John F. Kennedy]], Dominick made a successful run for the [[United States House of Representatives]]. He defeated freshman [[Democratic Party|Democrat]] Byron Lindberg Johnson (1917-2000) and abandoned his law career in 1961. After a single term in the House of Representatives, Dominick was elected to the [[United States Senate]], defeating one-term incumbent Democrat John Albert Carroll (1901-1983), 53.6 to 45.6 percent. He was reelected in 1968 over Democrat Stephen Lucid Robert  McNichols (1914-1997), a former Colorado [[governor]. 58.6 to 41.5 percent. Dominick voted in favor of the [[Civil Rights Act of 1964]], the [[Voting Rights Act of 1965]], the confirmation of [[Thurgood Marshall]] as the first [[African American]] nominated to the [[United States Supreme Court]].<ref>{{cite web|url=https://www.govtrack.us/congress/votes/90-1968/s346|title=TO PASS H.R. 2516, A BILL TO PROHIBIT DISCRIMINATION IN SALE OR RENTAL OF HOUSING, AND TO PROHIBIT RACIALLY MOTIVATED INTERFERENCE WITH A PERSON EXERCISING HIS CIVIL RIGHTS, AND FOR OTHER PURPOSES|publisher=govtrack}}</ref>

In 1956, Dominick was elected as a state representative, a post he filled  from 1957 to 1961. In 1960, with Richard Nixon carrying Colorado over [[John F. Kennedy]], Dominick made a successful run for the [[United States House of Representatives]]. He defeated freshman [[Democratic Party|Democrat]] Byron Lindberg Johnson (1917-2000) and abandoned his law career in 1961. After a single term in the House of Representatives, Dominick was elected to the [[United States Senate]], defeating one-term incumbent Democrat John Albert Carroll (1901-1983), 53.6 to 45.6 percent. He was reelected in 1968 over Democrat Stephen Lucid Robert  McNichols (1914-1997), a former Colorado [[governor]. 58.6 to 41.5 percent. Dominick voted in favor of the [[Civil Rights Act of 1964]], the [[Voting Rights Act of 1965]], the confirmation of [[Thurgood Marshall]] as the first [[African American]] nominated to the [[United States Supreme Court]].<ref>{{cite web|url=https://www.govtrack.us/congress/votes/90-1968/s346|title=TO PASS H.R. 2516, A BILL TO PROHIBIT DISCRIMINATION IN SALE OR RENTAL OF HOUSING, AND TO PROHIBIT RACIALLY MOTIVATED INTERFERENCE WITH A PERSON EXERCISING HIS CIVIL RIGHTS, AND FOR OTHER PURPOSES|publisher=govtrack.us}}</ref>

A strong environmentalist, Dominick advocated for the Wilderness Act of 1964,  the [[Clean Air Act]] of 1970, the Clean Water Act of 1972, and the [[Endangered Species Act]] of 1973.<ref>{{cite web|author=Hank Lacey|url=title=Colorado's Republican Civil Rights Icon|url=https://lawweekcolorado.com/|accessdate=July 15, 2021|publisher=''Law Week Colorado'' in Circuit Media |issue=13|date=March 29, 2021|volume=19|page=19|accessdate=July 15, 2021}}</ref>

A strong environmentalist, Dominick advocated for the Wilderness Act of 1964,  the [[Clean Air Act]] of 1970, the Clean Water Act of 1972, and the [[Endangered Species Act]] of 1973.<ref>{{cite web|author=Hank Lacey|url=title=Colorado's Republican Civil Rights Icon|url=https://lawweekcolorado.com/|accessdate=July 15, 2021|publisher=''Law Week Colorado'' in Circuit Media |issue=13|date=March 29, 2021|volume=19|page=19|accessdate=July 15, 2021}}</ref>

Dominick was from 1971 to 1972 the chairman of the National Republican Senatorial Committee. He lost his bid for a third term to Gary Hart, 57.2 to 39.5 percent. By then Dominick was suffering from [[multiple sclerosis]].<ref>{{cite web|url=https://www.nytimes.com/1981/03/20/obituaries/peter-h-dominick-is-dead-at-65-2-term-senator-from-coloado.htm|title=Peter H. Dominick is dead at 65; 2-term senator from Colorado|publisher=''[[The New York Times]]''|date=March 20, 1981|accessdate=July 15, 2021}}</ref>  

In 1971 to 1972, Dominick was the chairman of the National Republican Senatorial Committee. He lost his bid for a third term to Gary Hart, 57.2 to 39.5 percent. By then Dominick was suffering from [[multiple sclerosis]].<ref>{{cite web|url=https://www.nytimes.com/1981/03/20/obituaries/peter-h-dominick-is-dead-at-65-2-term-senator-from-coloado.htm|title=Peter H. Dominick is dead at 65; 2-term senator from Colorado|publisher=''[[The New York Times]]''|date=March 20, 1981|accessdate=July 15, 2021}}</ref>  

After leaving the Senate at the end of his term in 1975, he was appointed as United States Ambassador to [[Switzerland]] by U.S. President [[Gerald Ford]], but served less than three months. He died at Hobe Sound, [[Florida]] and is interred at Fairmount Cemetery in Denver.<ref>Peter Hoyt Dominick (1915-1981) - Find A Grave Memorial, accessed July 15, 2021}}</ref>

After leaving the Senate at the end of his term in 1975, he was appointed as United States Ambassador to [[Switzerland]] by U.S. President [[Gerald Ford]], but served less than three months. He died at Hobe Sound, [[Florida]] and is interred at Fairmount Cemetery in Denver.<ref>Peter Hoyt Dominick (1915-1981) - Find A Grave Memorial, accessed July 15, 2021}}</ref>